CN2331787Y

CN2331787Y - Single-cone three-piece type expansion hub

Info

Publication number: CN2331787Y
Application number: CN 98238331
Authority: CN
Inventors: 礼宏伟; 阎粤生
Original assignee: SHENYANG HEAVY MINERAL MACHINERY FACTORY
Current assignee: SHENYANG HEAVY MINERAL MACHINERY FACTORY
Priority date: 1998-07-22
Filing date: 1998-07-22
Publication date: 1999-08-04
Anticipated expiration: 2008-07-22

Abstract

The utility model relates to a single-cone three-piece type expansion sleeve which comprises an inner ring, a front outer ring and a rear outer ring. The utility model is characterized in that the inner surface of a ring body of the inner ring is provided with a ring groove; a conic body of the inner ring is provided with a stress relief groove; the front outer ring and the rear outer ring are sequentially sheathed on the conic body of the inner ring; the inner ring, the front outer ring and the rear outer ring are screwed up and are connected with each other by a screw bolt. With the utility model, production of shafts and hubs gets simple and the positioning accuracy gets high, so that the production cost is reduced and the material is saved. The utility model is the preferred product in the similar products.

Description

The single-cone three-piece type expansion set

The utility model relates to a kind of expansion set, particularly relates to a kind ofly making axle and hub bore processing is simple, Location accuracy is high, also can make axially locating, single-cone three-piece type expansion set that rust protection is good.

Key connecting or interference fit joint are normally adopted in connection in the mechanical transmission at present.Adopt the key connecting mode, because axle and wheel hub need be processed keyway, thereby have reduced fatigue strength widely, and bearing capacity is subjected to the shearing of key self and the restriction of crushing strength, can not bear the effect of heavy load and alternate load.Interference fit joint bearing capacity height, it is good with the ability of variable load to withstand shocks, and can avoid part owing to the processing keyway reduces bearing capacity again, but the fitting surface requirement on machining accuracy is higher, and assembling and dismounting are inconvenient, even need design hydraulic detachment handler.In addition, it is more loaded down with trivial details that interference fit joint is calculated, the various factors that influence cooperates in the calculating as: difficult grasps such as geometric parameter, structural factor, material parameter, working load, processing factors, therefore, the application of interference fit joint also is restricted.

For above-mentioned reasons, abroad five, the sixties develop a kind of new connection pattern, promptly expansion set connects.Its working principle is that the interior ring and the outer shroud of expansion set matches with axle and hub bore respectively, expansion set gives under the effect of tight power in circumferential high-strength bolt group, make interior ring and outer shroud with conical surface contact, dwindle and rise big (wedging principle), produce big magnitude of interference at the outer diametric plane of axle and the aperture surface of hub, thereby axle and hub are linked up, come transmitting torque by the frictional force that immense pressure produced between the coaxial and hub surface of contact of expansion set, axial force or both combined loads (interference fit joint principle), and when needs are dismantled, by the power of shirking of demounting bolt generation, in can making at an easy rate, outer shroud separates with hub with axle.

Expansion set connects except all advantages with interference fit joint; also has unique advantage; these advantages mainly are that axle and wheel hub are not all produced damage, are easy to the mounting or dismounting replacing; and reusable, less demanding to processing of axle and hole and quality of fit, economical with materials; also have advantages such as overload protection; but also can solve a difficult problem on a series of design and processes, but eliminate internal stress as the integrally annealed of belt conveyor ' s pulley body, have excellent popularization and be worth and the use prospect.Therefore, China has decided the NBS (GB5867-86) of expansion set in one nine eight six-year systems, stipulated five kinds of patterns, i.e. Z in its standard altogether ₁, Z ₂, Z ₃, Z ₄, Z ₅Z wherein ₂Type belongs to four formula expansion sets of bipyramid, is applicable to transmit less axial force or moment of torsion, is not suitable for transmitting moment of flexure but width is narrow, and during use, axle and wheel hub need give first location, make the hole processed complex.Z ₅Type belongs to five formula expansion sets of bipyramid, is applicable to transmit larger axis to power, moment of torsion, variable load and moment of flexure, and during use, axle and wheel hub do not need to give first location.Z ₂Type and Z ₅Type has common shortcoming, is exactly complex structure, and machining error is big.After the installation, because the edge of expansion set inner and outer rings after bolt is tightened, bears very high stress, expansion set inner and outer rings edge produces stress and concentrates (also being wedge angle stress), and its consequence can make axle crack, even fracture.In addition, bipyramid sliding pressure ring when engaging, do not combine with the periphery of hub (contact) with inner and outer rings with axle, so when mounted, do not note just may making pressure ring and circumference not parallel slightly, its result can make conical surface produce the line contact, local produce plastic deformation, be directed in use, seam crossing corrosion and losing efficacy.

The purpose of this utility model is at the problems referred to above, and a kind of single-cone three-piece type expansion set is provided.

The purpose of this utility model adopts following technical proposals to realize, that is:

The single-cone three-piece type expansion set is made up of interior ring, preceding outer shroud and back outer shroud.Interior ring is made up of ring body and cone, and is an overall structure.Ring body is provided with a plurality of preceding outer shroud bolts hole and a plurality of backs outer shroud bolt hole.On the internal surface of ring body, have compensating groove.Opening is arranged, and opening does not contact with ring body on conical section.Before have on the outer shroud a plurality of before the outer shroud bolts hole, the preceding outer shroud bolt hole on the preceding outer shroud is identical with specification with preceding outer shroud bolt hole number on the ring body, and the position is corresponding.Back outer shroud bolt hole on the back outer shroud is identical with specification with back outer shroud bolt hole number on the ring body, and the position is corresponding.Before outer shroud and back outer shroud be sleeved on successively on the cone of ring, and the outer collar bolt (high-strength bolt) of outer collar bolt and back before inserting respectively in preceding outer shroud bolt hole on ring body and the back outer shroud bolt hole, and before tightening respectively outer shroud with after outer shroud.

The utility model, promptly the single-cone three-piece type expansion set has plurality of specifications for selecting for use, and transferable moment of torsion is from 1.05KN.m to 1038KN.m, and axial force is from 63KN to 3462KN, and the attachable diameter of axle can satisfy the needs of various designs from 30mm to 600mm.In addition, the axial force that novel expansion set can transmit has increased relatively, can prevent the axial float of axle or hub effectively.The utility model can bear alternation, impulsive load and very big moment of flexure.Zui Da breakthrough is in design:

1, can make coupled wheel hub is single disc formula structure by the structural change of two disc formula.As the roller of Belt Conveyors, weight such as the diameter of axle, disc, bearing have all been alleviated, but economical with materials 20% has reduced cost effectively;

2, common expansion set can only connect parts, and the utility model can connect two or three parts with interior ring, preceding outer shroud, back outer shroud respectively.As duplex or triple gear, can change into processing respectively by original integral body processing, with novel expansion set they are linked up then, processing cost has been reduced, also saved material simultaneously;

3, novel expansion set has been opened a compensating groove on interior ring ring body, and interior ring conical section opening do not reach head, makes inner and outer rings surface pressure more even, and does not have the stress concentration phenomenon, makes contact more even, connects more reliable;

4, novel expansion set is to tighten former and later two outer shrouds respectively by two groups of high-strength bolts, so when connecting same parts with two outer shrouds, the moment of torsion that can transmit is the moment of torsion sum that two outer shrouds can transmit, and the other types expansion set, when connecting same parts with two or three expansion sets, the moment of torsion that can transmit is respectively 1.8 times, 2.7 times of expansion set theoretical torque;

5, convenient disassembly.As long as adopt demounting bolt, just can rapidly preceding outer shroud, back outer shroud be unloaded.

Fig. 1 is a structural representation of the present utility model, Fig. 2 is the left view of Fig. 1, Fig. 3 is interior ring structure schematic representation, Fig. 4 is the left view of Fig. 3, Fig. 5 is interior ring surface structure schematic representation, and Fig. 6 is preceding outer shroud structural representation, and Fig. 7 is the left view of Fig. 6, Fig. 8 is a back outer shroud structural representation, and Fig. 9 is the left view of Fig. 8.The utility model is described in further detail below in conjunction with accompanying drawing.

The single-cone three-piece type expansion set is assembled into by interior ring 3, preceding outer shroud 4, back outer shroud 5.

In ring 3 constitute by ring body 6 and cone 7, ring body 6 and cone 7 are an overall structure.Outer shroud bolt hole 8 and 2 demounting bolt holes 9 after being provided with 12,4 of 4 preceding outer shroud bolt holes on the ring body 6.Have compensating groove 10 on the internal surface of ring body 6, have opening slot 11 on cone 7, opening slot 11 does not contact with ring body 6.Outer shroud bolt hole 14 after 4 preceding outer shroud bolt holes 13 and 4 are arranged on the preceding outer shroud 4.Outer shroud bolt hole 15 after having 4 on the outer shroud 5 of back.Before outer shroud 4, back outer shroud 5 be sleeved on successively on ring 3 the cone 7, and with outer collar bolt 2 before 4 with 4 after outer collar bolt 1 with interior ring 3, preceding outer shroud 4 with after outer shroud 5 give tightly and being in the same place.

Claims

1, single-cone three-piece type expansion set comprises interior ring (3), preceding outer shroud (4), back outer shroud (5), it is characterized in that:

A, interior ring (3) are made of ring body (6) and cone (7), ring body (6) and cone (7) are an overall structure, on the internal surface of ring body (6), have compensating groove (10), on cone (7), have opening (11), opening (11) does not contact with ring body (6), on ring body (6), be provided with a plurality of before outer shroud bolt hole (12), a plurality of back outer shroud bolt hole (8), a plurality of demounting bolts hole (9);

A plurality of preceding outer shroud bolt holes (13) and a plurality of backs outer shroud bolt hole (14) are arranged on B, the preceding outer shroud (4), a plurality of backs outer shroud bolt hole (15) is arranged on back outer shroud (5);

C, preceding outer shroud (4), back outer shroud (5) are sleeved on the cone (7) of interior ring (3) successively, and with outer collar bolt (2) before a plurality of and a plurality of outer collar bolts in back (1) interior ring (3), preceding outer shroud (4), back outer shroud (5) are given tightly together.